Michelle RobertsDigital health editor, BBC News
Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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中國商務部發言人補充：「中國一貫反對一切形式的單邊關稅增加，並一再強調貿易戰沒有贏家，保護主義沒有出路。」